Grinding and polishing machine



.Jau-1M.'I 16,1923.

. 1,442,3831. R. E. SOLE. I

GRINDINGVAND POLISHING MACHIN. met JUNE 1. 1921.

gfx/vento@ Patented Jian. i6, 11923.

rara-nr ROBERT E. BOLE, OF LOS ANGELES, CALIFORNIA.

GRINDING- AND POLISHING MACHINE.

Application led .Tune 7, 1921.

To all whom t may concern:

Be it known that I, ROBERT E. Born, a citizen or" the United States, residing at Los Angeles, in the county oli Los Angeles and State ot California, have invented a new and useful Grinding and Polishing lilla.- chine, ot which the lfollowing is a specification.

This invention relates to a Vgrinding and polishing machine particularly adapted for grinding -and polishing cylindrical surfaces and has for its object to :provide a machine combining means for rotating the worl, and a grinding wheel rotatably journaled in a plane at right angles to the axial plane of the worl; whereby the side surfaces of the wheel engage the work.

Another object is to provide a machine in which the grinding wheel engages a relativelyv long area fol the work to contact several high spots at vone time, functioning in the manner ot a straight edge and grinding the high spots down to a true surface.

Another object is to provide a machine having a grinding wheel which iis rotatably journaled in a plane at right angles to the axial plane ol. the work and which 'is freely universally movable towards and l'rom the. work and longitudinally ol the work with the side 'surface of the wheel engaging the work and functioning las a straight edge simultaneously spanning and extended area ot the work whereby the necessity for a positive leed of the wheel relative to the work is obviated` A Another object is to provide amachine of the above character in which the grinding wheel is carried by a pendulum arm universally movable on its supporting means and longitudinally translatable relative thereto.

Another object is to provide a machine having a pendulum arm carrying the grinding wheel and a motor and 'transmission nieans lor said wheel, with the arm universally supported tor movement ot' the wheel to and trom the work and longitudinally 'ot the work, and bodily movable longitiulinall)v ot' the machine to vary the zone ot the work engaged by the wheel. l

`Various other objects and advantages will be more fully apparent "by the following description and accompanying drawings, which torni a part ot this disclosure and Serial N0. 475,605.

which illustrate a preferred liorm ment ot the invention.

"Ot the drawings:

Figure l is a troni: yelevation of the machine.

.Fi'gure 2 is an end elevation with one of the upright trame extensions broken 01T.

VFigure 3 is an enlarged detail section on line l-- `of Figure l.

The machine of the present invention is particularly vdesigned to grind and polish cylindrical pieces `of work such as shating, tubing, cylinders or other parts having relatively extended cylindrical surta-ces of univterm diameter, and the machine is arranged to 'accurately and rapidly accomplish the grinding of such cylindrical surfaces with a grinding wheel which is universally mounted and free to swing in any direction, thereby eliminating the necessity of providing positive feeding mechanism for 'the grinding wheel and also el'in'iinating any requirement for primary adjustment lor setting ot' the mechanism.

ln the present device, in which the side (rt the grinding wheel engages the work and in which the wl'reel is ol a size which will span a Iconsiderable portion ol the length ot the work, the wheel functions in the manner ol a straight edge to produce a true, accurately grounded surlace and will operate without any tendency to spring the work.

The machine as illustrated comprises a bed l, a head stock 2 fixed atene end 4ot the bed and tail stock 3 slida'ble along the bed, the live spindle of the head stock having associated therewith a suitable 'chuck 4 to receive the work andthe tail stock having the dead center 5 axially aligned with the head stock spindle. rThis arrangement may tollow the standard type of `engine lathe as illustrated vor may be of any suit-able special design.

The grinding mechanism is carried by an overhead support Vconiprising a stationary rod 6 tixed at opposite ends in upright extensions 'T ot the framework ot" the lathe. The rod `6 is relatively aligned parallel with the axial lplane of the work and slidable longitudinally of 'the rod 6 is a carriage S which is also freely rotatable on Ithe rod, and which is provided with vopposed trunnions 9. (See Fig. pendulum arm is torn'ied ol' two opposed channel beams l0 relatively held in of embodispaced relation by end blocks 11 and 12, with the beams and the blocks rigidly secured together to form an integral unit. The channel beams 10 intermediate their ends are transversely apertured and have secured to their outer surfaces iiller blocks 13 which are correspondingly apertured with the apertures of the beams 10 and their respective filler blocks beingl aligned to receive bearing bushings 14. The opposed trunnions 9 of the carriage 8 engage in the respective bearing bushings 111-, this structure providing a universal connection for the pendulum arm which will permit it to swing transversely or longitudinally and at the same time will permit the arm to be bodily translated along the rod 6. At the lower end of the pendulum arm is a journal bearing 15 (see Fig. 2) disposed in a plane at right angles to the axial plane of the work and the rod 6, and rotatably journaled in said bearing is a spindle 16 having fixed to its forward end the grinding wheel 17 and to its rearward end a belt pulley 1S. Mounted upon the upper end of the pendulum arm isan electric motor 19 having a belt pulley 20' and a belt 21 engages over the belt pulley 20 and the belt pulley 1S. Gpposed handles 22 are provided at the lower end of the pendulum arm and a suitable guard 28 extends over the upper edge of the grinding wheel.

The operation of the machine, with the work in position in the lathe and being rotated by the head stock spindle, the operator by means of the handles 22 swings the grinding wheel forwardly to engage the work and then swings it longitudinally of the work in a grinding operation. At intervals and by a preponderant longitudinal pull on one of the handles 22, the operator can translate the pendulum arm bodily along the rod 6 so that the zone of the work engaged by the wheel will be varied from time to time until the entire length of the work has been engaged. lThis longitudinal swing of the pendulum and its translation bodily along the work will be continued until the work has been ground down to the required diameter.

It will be evident from the above that this machine is capable of accurately and quickly grinding cylindrical surfaces by engagement of the side of the grinding wheel with the work and that the wheel will function as a straight edge so as to produce a job of universal diameter throughout its length without the employment of any type of positive feed for the wheel. In practical use of the machine illustrated in the drawings it has been found that there is a certain flexibility in the pendulum arm 10, which permits the operator to precisely align the side of the grinding wheel with the work to be ground. If it is desired to taper the work this can be accomplished by shifting the center in the tail stock.

It is to be understood that the present invention is not limited to the precise details of construction of the grinding wheel mounting or of the work rotating means as it is evident that various types of work rotating means may be employed and that various modifications of the construction of the grinding wheel mounting may be made without departing from the broad scope of the claims which follow.

I claim:

1. In a machine of the nature disclosed, the combination with means for rotating the work, of an overhead support, a depending arm universally connected to the support to permit a pendulum swing of the arm longitudinally and transversely of the work, a grinding wheel journaled in the lower end of the arm in an axial plane at right angles to the axial plane of the work adapting its side surface to engage the work, the universal connection permitting the arm to be swung transversely to bring the wheel into engagement with the work and to be swung longitudinally during a grinding operation and arranged to permanently maintain the side surface of the grinding wheel parallel with the work.

2. In a machine of the nature disclosed, the combination with means for rotating the work, of an overhead slideway longitudinally aligned parallel with the work, a pendulum arm mounted to slide longitudinally of the slideway and to swing universally thereon, a grinding wheel journaled in the lower end of the arm in a plane at right angles to the axial plane of the work, the universal connections permitting the arm to be swung transversely to bring the side of the wheel against the work and to be swung longitudinally during a grinding operation and arranged to permanently maintain the side surface of the grinding wheel parallel with the work, the arm being slidable on the slideway to vary the zone of longitudinal swing of the arm.

3. In a machine of the nature disclosed, the combination with means for rotating the work, a frame including an overhead rod parallel to the axial plane of the work, a car riage slidable on the rod and adapted to rock in a plane transverse thereto, a pendulum arm pivoted on the carriage to swing longitudinally of the rod, a grinding wheel journaled in the lower end of the arm in a plane at right angles to the axial plane of the rod with the side surface of the wheel parallel with the work.

a. In a machine of the nature disclosed, the combination with work rotating means, of a frame including an overhead rod parallel with the axial plane of the work, a pendulum arm universally connected intermediate its ends to the rod, a grinding Wheel Signed at Los Angeles, California, this journaled in the lower end of the arm in a 31st clay of May 1921. plane at right angles to the axial plane of the Work With its side surfaces parallel With the ROBERT E' BGLE Work, a motor supported on the upper end Witnesses: of the arm, and transmission means connect- L. SAXTON LYON,

ing the motor and grinding wheel. L. BELLE WEAVER. 

